首次提出了工程语义层次划分准则和分类原则,即根据工程图样投影表达过程划分为表达方式语义、投影关系语义和尺寸约束语义等3个层次,每一层次又根据信息表达的深度和语义描述的需要,划分为显式的低层语义和隐式的高层语义两大类,并较为系统地归类了显式语义和较为深入地挖掘了隐式语义,从而赋予了图样工程语义动态性、层次性、易于形式化等特征,为机械工程图样的理解奠定了较扎实的基础.

The level dividing rules and classifying principles of engineering semantics of the practical engineering drawings are advanced for the first time. According to the process of the projection expression, the semantics are divided into expression mode semantics, projection relation semantics and dimension constraint semantics. Furthermore, every level is classified to lower explicit semantics and upper hidden semantics, which the engineering semantics is characterized by dynamic, hierarchy and formalization through analyzing systematic the explicit semantics and digging deepening the hidden semantics.